Communication device and radar

Abstract

The utility model discloses a communication device and a radar. The communication device comprises a first circuit board, a second circuit board, a driving part, a first light-emitting device, a second light-emitting device, a first receiving device and a second receiving device, the first circuit board and the second circuit board are located on the two opposite sides of the driving part, and the driving part is connected with the second circuit board so as to drive the second circuit board to rotate relative to the first circuit board; a light transmission channel is formed in the driving part, the first light-emitting device and the second receiving device are arranged on the second circuit board in a spaced mode, the second light-emitting device and the first receiving device are arranged on the first circuit board in a spaced mode, and light signals emitted by the first light-emitting device can be transmitted to the first receiving device through the light transmission channel. An optical signal emitted by the second light-emitting device can be transmitted to the second receiving device through the light-passing channel, and the first light-emitting device, the first receiving device and the driving part are coaxially arranged. According to the scheme, the problem that a communication device related to the related technology is low in optical communication rate can be solved.

Description

Technical Field

[0001] This application belongs to the field of lidar or millimeter-wave radar technology, specifically relating to a communication device and radar. Background Technology

[0002] Radar is widely used in surveying, transportation, security, and autonomous driving due to its outstanding advantages such as a large detection field of view, high ranging accuracy, long detection range, and small near-field blind zone. Internally, radar typically communicates via spatial light; that is, the radar's communication device can transmit information in a vacuum or atmosphere using light waves as the carrier.

[0003] To enable radar to perform more functions, the communication device employs at least two pairs of light-emitting and receiving devices for bidirectional information transmission. This configuration achieves full-duplex, two-way communication, broadening the radar's application range. However, despite achieving full-duplex communication, this communication device still suffers from the relatively low speed of optical communication, which can negatively impact the radar's communication quality.

[0004] In summary, the communication devices involved in the relevant technologies suffer from low optical communication rates. Utility Model Content

[0005] This application discloses a communication device and a radar to solve the problem of low optical communication rates in communication devices involved in related technologies.

[0006] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0007] A communication device includes a first circuit board, a second circuit board, a driver, a first light-emitting device, a second light-emitting device, a first receiving device, and a second receiving device.

[0008] The first circuit board and the second circuit board are located on opposite sides of the driving member, and the driving member is connected to the second circuit board to drive the second circuit board to rotate relative to the first circuit board;

[0009] The driving component has a light transmission channel. The first light-emitting device and the second receiving device are spaced apart on the second circuit board, and the second light-emitting device and the first receiving device are spaced apart on the first circuit board. The light signal emitted by the first light-emitting device can be transmitted to the first receiving device through the light transmission channel, and the light signal emitted by the second light-emitting device can be transmitted to the second receiving device through the light transmission channel. The first light-emitting device, the first receiving device, and the driving component are coaxially arranged.

[0010] A radar includes a measurement component and the communication device described above, wherein the measurement component is disposed on a second circuit board.

[0011] The technical solution adopted in this application can achieve the following beneficial effects:

[0012] In this application, since the first light-emitting device and the second receiving device are spaced apart on the second circuit board, and the second light-emitting device and the first receiving device are spaced apart on the first circuit board, and the light signal emitted by the first light-emitting device can be transmitted to the first receiving device through the optical transmission channel, and the light signal emitted by the second light-emitting device can be transmitted to the second receiving device through the optical transmission channel, the communication device disclosed in this application can realize full-duplex bidirectional communication function. Simultaneously, since the first light-emitting device, the first receiving device, and the driving component are coaxially arranged—that is, during the process of the driving component driving the second circuit board to rotate—the first light-emitting device, the first receiving device, and the driving component are always coaxially arranged. This ensures that the effective signal light power received by the first receiving device from the first light-emitting device is maximized, which can improve the optical signal-to-noise ratio of the communication device, thereby increasing the optical communication rate. In other words, this arrangement can achieve high-speed and stable spatial optical communication. Therefore, the communication device disclosed in this application can solve the problem of low optical communication rates in communication devices involved in related technologies. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the communication device disclosed in the embodiments of this application;

[0014] Figure 2 This is a partial structural schematic diagram of the communication device disclosed in the embodiments of this application;

[0015] Figure 3 This is a schematic diagram illustrating the structure of the communication device disclosed in the embodiments of this application, which includes a first signal converter and a second signal converter and / or a third signal converter and a fourth signal converter.

[0016] Explanation of reference numerals in the attached figures:

[0017] 110 - First circuit board; 120 - Second circuit board;

[0018] 200-Driver component, 210-Light transmission channel, 220-Spindle, 230-Drive unit;

[0019] 310 - First light-emitting device, 320 - Second light-emitting device, 321 - First sub-light-emitting device, 322 - Second sub-light-emitting device, 323 - Light-emitting area;

[0020] 410 - First receiving device, 420 - Second receiving device;

[0021] 510 - First signal converter, 520 - Second signal converter, 530 - Third signal converter, 540 - Fourth signal converter;

[0022] 610 - First processor, 620 - Second processor, 630 - Third processor, 640 - Fourth processor. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The communication device disclosed in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0025] Please refer to Figures 1-3 This application discloses a communication device, which includes a first circuit board 110, a second circuit board 120, a driver 200, a first light-emitting device 310, a second light-emitting device 320, a first receiving device 410, and a second receiving device 420.

[0026] The first circuit board 110 and the second circuit board 120 are located on opposite sides of the driving member 200. Optionally, the first circuit board 110 and the second circuit board 120 are arranged in parallel. The driving member 200 is connected to the second circuit board 120 to drive the second circuit board 120 to rotate relative to the first circuit board 110.

[0027] The driving component 200 has a light-transmitting channel 210, the axis of which coincides with the rotation axis of the driving component 200. Here, the rotation axis of the driving component 200 can be the rotation axis of the second circuit board 120. Optionally, the driving component 200 can be an internal rotor motor or an external rotor motor. Specifically, the driving component 200 can include a main shaft 220 and a driving part 230. The main shaft 220 is located within the driving part 230. When the driving component 200 is an internal rotor motor, the main shaft 220 can rotate relative to the driving part 230, and in this case, the main shaft 220 can be connected to the second circuit board 120. When the driving component 200 is an external rotor motor, the driving part 230 can rotate around the main shaft 220, and in this case, the driving part 230 can be connected to the second circuit board 120. For an example of the driving part 230 driving the second circuit board 120 to rotate, please refer to [reference needed]. Figure 2In the figure, the arrow extending circumferentially along the main shaft 220 indicates the rotation direction of the drive unit 230. During the rotation of the drive unit 230, it can drive the second circuit board 120 to rotate relative to the first circuit board 110. One end of the main shaft 220 can be located on the first circuit board 110, and the light transmission channel 210 passes through the main shaft 220, so that a portion of the first circuit board 110 is located at one end of the light transmission channel 210, and a portion of the second circuit board 120 is located at the other end of the light transmission channel 210. That is, at this time, the portions of the first circuit board 110 and the portions of the second circuit board 120 are arranged opposite each other.

[0028] The first light-emitting device 310 and the second receiving device 420 are spaced apart on the second circuit board 120. The second circuit board 120 ensures that the first light-emitting device 310 and the second receiving device 420 work normally. Specifically, the first light-emitting device 310 and the second receiving device 420 are located on the side of the second circuit board 120 facing the first circuit board 110. The second light-emitting device 320 and the first receiving device 410 are spaced apart on the first circuit board 110. The first circuit board 110 ensures that the second light-emitting device 320 and the first receiving device 410 work normally. Specifically, the second light-emitting device 320 and the first receiving device 410 are located on the side of the first circuit board 110 facing the second circuit board 120.

[0029] Please refer to Figure 2 The light signal emitted by the first light-emitting device 310 can be transmitted to the first receiving device 410 through the light transmission channel 210. That is, after the light signal emitted by the first light-emitting device 310 enters the light transmission channel 210, it can be received by the first receiving device 410. Specifically, the light signal emitted by the first light-emitting device 310 can be transmitted along... Figure 2 The direction in which the first light-emitting device 310 points to the first receiving device 410 is the direction indicated by the arrow line between the first light-emitting device 310 and the first receiving device 410.

[0030] The optical signal emitted by the second light-emitting device 320 can be transmitted to the second receiving device 420 through the optical transmission channel 210. That is, after the optical signal emitted by the second light-emitting device 320 enters the optical transmission channel 210, it can be received by the second receiving device 420. Specifically, the optical signal emitted by the second light-emitting device 320 can be transmitted along... Figure 2 The second light-emitting device 320 points in the direction of the second receiving device 420, that is, the light propagates in the direction indicated by the arrow between the second light-emitting device 320 and the second receiving device 420. In other words, at this time, the propagation direction of the light signal emitted by the first light-emitting device 310 is opposite to the propagation direction of the light signal emitted by the second light-emitting device 320, which enables the communication device disclosed in this application to realize full-duplex bidirectional communication function.

[0031] Since the driving unit 230 can drive the second circuit board 120 to rotate relative to the first circuit board 110, the driving unit 230 can simultaneously drive the first light-emitting device 310 and the second receiving device 420 to rotate. Please refer to [reference needed]. Figure 2 In the figure, the upper surface of the cylinder formed by the dashed lines is the trajectory surface formed by the second receiving device 420 during rotation. At the same time, since the first light-emitting device 310, the first receiving device 410 and the driving member 200 are coaxially arranged, that is, the first light-emitting device 310 and the first receiving device 410 are arranged sequentially on the rotation axis of the driving member 200, the first light-emitting device 310 can always be coaxially arranged with the first receiving device 410 and the driving member 200 during the rotation process, so as to ensure that the effective signal light power received by the first receiving device 410 emitted by the first light-emitting device 310 is maximized.

[0032] In this application, since the first light-emitting device 310 and the second receiving device 420 are spaced apart on the second circuit board 120, and the second light-emitting device 320 and the first receiving device 410 are spaced apart on the first circuit board 110, and the light signal emitted by the first light-emitting device 310 can be transmitted to the first receiving device 410 through the light transmission channel 210, and the light signal emitted by the second light-emitting device 320 can be transmitted to the second receiving device 420 through the light transmission channel 210, the communication device disclosed in this application can realize full-duplex bidirectional communication function. Simultaneously, since the first light-emitting device 310, the first receiving device 410, and the driving component 200 are coaxially arranged, that is, during the process of the driving component 200 driving the second circuit board 120 to rotate, the first light-emitting device 310, the first receiving device 410, and the driving component 200 are always coaxially arranged. This ensures that the effective signal light power received by the first receiving device 410 from the first light-emitting device 310 is maximized, which can improve the optical signal-to-noise ratio of the communication device, thereby increasing the optical communication rate. In other words, this arrangement can achieve high-speed and stable spatial optical communication. Therefore, the communication device disclosed in this application can solve the problem of low optical communication rate in the communication devices involved in the related technology.

[0033] Alternatively, please refer to Figure 1 The first circuit board 110 and the second circuit board 120 can be arranged sequentially along a vertical direction, or the first circuit board 110 and the second circuit board 120 can be arranged sequentially along any direction intersecting the vertical direction. That is, the communication device disclosed in this application can be... Figure 1 After rotating to any angle, the setup is as follows: ensure that the first circuit board 110 and the second circuit board 120 are always parallel, and that the first light-emitting device 310, the first receiving device 410, and the driving device 200 are always coaxially positioned.

[0034] Optionally, in the direction perpendicular to the extension direction of the rotation axis of the driving member 200, i.e., in the radial direction of the main shaft 220, the distance between the second light-emitting device 320 and the rotation axis can be a first distance, and the distance between the second receiving device 420 and the rotation axis can be a second distance. The first distance can be equal to the second distance, i.e., the second light-emitting device 320 is located at... Figure 2 The intersection of the side surface and the lower surface of the cylinder enclosed by the aforementioned dotted lines allows the second receiving device 420 to be coaxially positioned at a certain moment during the rotation of the second circuit board 120. At this time, the arrangement direction of the second light-emitting device 320 and the second receiving device 420 is the same as the axial direction of the main shaft 220. This can, to a certain extent, increase the effective signal light power received by the second receiving device 420 from the second light-emitting device 320, thereby improving the optical signal-to-noise ratio of the communication device. Of course, the first distance may not be equal to the second distance.

[0035] Optionally, the first light-emitting device 310, the second light-emitting device 320, the first receiving device 410 and the second receiving device 420 can all be conventional diodes, or the first light-emitting device 310 and the second light-emitting device 320 can be semiconductor lasers, and the first receiving device 410 and the second receiving device 420 can be other devices that can receive optical signals.

[0036] In another embodiment, at least one of the first light-emitting device 310 and the second light-emitting device 320 can be an optical emitting module, and at least one of the first receiving device 410 and the second receiving device 420 can be an optical receiving module. Specifically, the optical emitting module and the optical receiving module can be dedicated communication modules for emitting or receiving light in TO (Transistor Outline) packages. In this case, the junction capacitance of the first light-emitting device 310, the junction capacitance of the second light-emitting device 320, the junction capacitance of the first receiving device 410, and the junction capacitance of the second receiving device 420 are all smaller than the junction capacitance of a conventional diode. This can significantly improve the optical communication bandwidth and communication rate, thereby significantly improving the communication reliability. Meanwhile, since at least one of the first light-emitting device 310 and the second light-emitting device 320 is a light-emitting module, and at least one of the first receiving device 410 and the second receiving device 420 is a light-receiving module, the divergence angle of at least one of the first light-emitting device 310 and the second light-emitting device 320 and the receiving angle of at least one of the first receiving device 410 and the second receiving device 420 are small. When the first light-emitting device 310, the first receiving device 410 and the driving member 200 are coaxially arranged, it can be ensured that the first receiving device 410 can receive the light signal emitted by the first light-emitting device 310 more reliably.

[0037] Optionally, the first light-emitting device 310 can be used to emit light with a first wavelength range, that is, the wavelength of the light emitted by the first light-emitting device 310 is within the first wavelength range, and the first receiving device 410 can be used to receive light with a second wavelength range, that is, the wavelength of the light that the first receiving device 410 can receive is within the second wavelength range, and the first wavelength range is located within the second wavelength range, that is, the first wavelength range is a subset of the second wavelength range. In this case, the first receiving device 410 can receive all the light emitted from the first light-emitting device 310 to ensure the integrity of the light signal received by the first receiving device 410. Of course, the first wavelength range can also be exactly equal to the second wavelength range.

[0038] Optionally, the second light-emitting device 320 can be used to emit light with a third wavelength range, that is, the wavelength of the light emitted by the second light-emitting device 320 is within the third wavelength range, and the second receiving device 420 can be used to receive light with a fourth wavelength range, that is, the wavelength of the light that the second receiving device 420 can receive is within the fourth wavelength range, and the third wavelength range is located within the fourth wavelength range, that is, the third wavelength range is a subset of the fourth wavelength range. In this case, the second receiving device 420 can receive all the light emitted from the second light-emitting device 320 to ensure the integrity of the light signal received by the second receiving device 420. Of course, the third wavelength range can also be exactly equal to the fourth wavelength range.

[0039] Optionally, the second wavelength range may not overlap with the fourth wavelength range, meaning there is no intersection between them. Consequently, the first wavelength range also does not overlap with the third wavelength range. This avoids mutual interference between the optical signals received by the first receiving device 410 and the second receiving device 420, ensuring the communication quality and full-duplex spatial optical communication effect of the communication device. Of course, a small overlap between the second and fourth wavelength ranges is also possible.

[0040] Optionally, the number of second light-emitting devices 320 can be one.

[0041] In another embodiment, please refer to Figure 1 and Figure 2 The number of second light-emitting devices 320 can be at least two, including a first sub-light-emitting device 321 and a second sub-light-emitting device 322. The first sub-light-emitting device 321 and the second sub-light-emitting device 322 are spaced apart along the direction surrounding the first receiving device 410, and in the radial direction of the main shaft 220, the distance between the first sub-light-emitting device 321 and the rotation axis of the driving member 200 is equal to the distance between the second sub-light-emitting device 322 and the rotation axis of the driving member 200, that is, the first sub-light-emitting device 321 and the second sub-light-emitting device 322 are spaced apart at... Figure 2The intersection of the side surface and the lower surface of the cylinder enclosed by the aforementioned dashed lines. In this embodiment, a portion of the light-emitting area of ​​the first sub-light-emitting device 321 overlaps with a portion of the light-emitting area of ​​the second sub-light-emitting device 322, and the second receiving device 420 is always completely located within the light-emitting area.

[0042] Specifically, during the rotation of the second circuit board 120, the second receiving device 420 can be located within the light-emitting area of ​​the first sub-light-emitting device 321, excluding the overlapping area, at the first moment; at the second moment, the second receiving device 420 can be located within the overlapping area of ​​the first sub-light-emitting device 321 and the second sub-light-emitting device 322; at the third moment, the second receiving device 420 can be located within the light-emitting area of ​​the second sub-light-emitting device 322, excluding the overlapping area; at the next moment, the second receiving device 420 can be located within the light-emitting area of ​​the first sub-light-emitting device 321 again, and so on. This ensures that the second receiving device 420 can always receive a light signal of sufficient intensity, which can further improve the effective signal light power received by the second receiving device 420 from the second light-emitting device 320, thereby further improving the optical signal-to-noise ratio of the communication device.

[0043] Optionally, the number of second receiving devices 420 can be one.

[0044] In another embodiment, the number of second receiving devices 420 can be at least two. Each second receiving device 420 is spaced apart along the direction surrounding the first light-emitting device 310, and each second receiving device 420 is always located within the light-emitting area 323 of the second light-emitting device 320. As the multiple second receiving devices 420 rotate with the second circuit board 120, they can receive more light signals emitted by the second light-emitting device 320. That is, this arrangement can ensure that the multiple second receiving devices 420 can receive light signals of sufficient intensity at any angle.

[0045] In a further embodiment, the number of second light-emitting devices 320 and the number of second receiving devices 420 can both be at least two. By using multiple second light-emitting devices 320 and multiple second receiving devices 420, the effective signal light power received by the second receiving device 420 from the second light-emitting devices 320 can be further improved, thereby further improving the optical signal-to-noise ratio of the communication device and ensuring the communication quality of the communication device.

[0046] Alternatively, please refer to Figure 3The communication device may further include a first signal converter 510 and a second signal converter 520. Optionally, the first signal converter 510 may be a first serializer, and the second signal converter 520 may be a first deserializer. The communication device may further include a first processor 610 and a second processor 620. The first processor 610 and the first signal converter 510 are both disposed on the second circuit board 120 and are both electrically connected to the first light-emitting device 310. The second processor 620 and the second signal converter 520 are both disposed on the first circuit board 110 and are both electrically connected to the first receiving device 410.

[0047] In this embodiment, the first signal converter 510 can encode and convert multiple low-speed parallel transmission data sent by the first processor 610 into a single high-speed serial transmission data, which is then modulated into a spatial light signal by the first light-emitting device 310 and transmitted to the first receiving device 410. Figure 3 The arrows in the diagram indicate the data transmission direction. The first receiving device 410 demodulates a single high-speed serial data stream from the spatial optical signal. The second signal converter 520 decodes this high-speed serial data stream and converts it into multiple low-speed parallel data streams, which are then transmitted to the second processor 620. Therefore, this configuration allows for the simultaneous transmission of multiple parallel data streams, effectively increasing the communication rate and achieving high-speed optical communication. Of course, the communication device may also exclude the first signal converter 510 and the second signal converter 520.

[0048] Alternatively, please refer to Figure 3 The communication device may further include a third signal converter 530 and a fourth signal converter 540. Optionally, the third signal converter 530 may be a second serializer, and the fourth signal converter 540 may be a second deserializer. The communication device may further include a third processor 630 and a fourth processor 640. The third processor 630 and the third signal converter 530 are both disposed on the first circuit board 110 and are both electrically connected to the second light-emitting device 320. The fourth processor 640 and the fourth signal converter 540 are both disposed on the second circuit board 120 and are both electrically connected to the second receiving device 420.

[0049] In this embodiment, the third signal converter 530 can encode and convert multiple low-speed parallel transmission data sent by the third processor 630 into a single high-speed serial transmission data, which is then modulated into a spatial light signal by the second light-emitting device 320 and transmitted to the second receiving device 420. Figure 3The arrows indicate the data transmission direction. The second receiving device 420 demodulates a high-speed serial data stream from the spatial optical signal. The fourth signal converter 540 decodes this high-speed serial data stream and converts it into multiple low-speed parallel data streams, which are then transmitted to the fourth processor 640. Therefore, this configuration can transmit multiple parallel data streams simultaneously, effectively increasing the communication rate and achieving high-speed optical communication. Of course, the communication device may also exclude the third signal converter 530 and the fourth signal converter 540.

[0050] In a further embodiment, when the communication device disclosed in this application simultaneously includes the first signal converter 510, the second signal converter 520, the third signal converter 530 and the fourth signal converter 540, this can further increase the bidirectional communication rate of the communication device by several times, thereby further increasing the communication rate of the entire communication device.

[0051] Optionally, the first processor 610, the second processor 620, the third processor 630 and the fourth processor 640 can be commonly used FPGA (Field Programmable Gate Array) or MPU (Micro Processor Unit) processing devices.

[0052] Optionally, the first light-emitting device 310, the second light-emitting device 320, the first receiving device 410, and the second receiving device 420 can all be located within the light transmission channel 210. In this case, the driving member 200 can protect the first light-emitting device 310, the second light-emitting device 320, the first receiving device 410, and the second receiving device 420, and can ensure that as much light emitted by the first light-emitting device 310 and the second light-emitting device 320 as possible enters the light transmission channel 210, so as to be received by the first receiving device 410 and the second receiving device 420 respectively. Of course, the first light-emitting device 310, the second light-emitting device 320, the first receiving device 410, and the second receiving device 420 may not all be located within the light transmission channel 210, or may only be partially located within the light transmission channel 210.

[0053] Optionally, this application also discloses a radar, including a measuring component and the communication device described above. The measuring component is located on a second circuit board 120 and can measure parameters such as distance. The driving component 200 can drive the second circuit board 120 to rotate 360° or other angles, thereby driving the measuring component to rotate 360° or other angles for measurement, so that the radar disclosed in this application can perform all-round detection. At the same time, since the radar's communication device can achieve high-speed and stable spatial optical communication, this can improve the overall performance of the radar product.

[0054] Optionally, the radar disclosed in this application may be a lidar or a millimeter-wave radar, or of course, other types of radar.

[0055] The above embodiments of this application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be described in detail here.

[0056] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A communication device, characterized in that, It includes a first circuit board (110), a second circuit board (120), a driver (200), a first light-emitting device (310), a second light-emitting device (320), a first receiving device (410), and a second receiving device (420). The first circuit board (110) and the second circuit board (120) are located on opposite sides of the driving member (200), and the driving member (200) is connected to the second circuit board (120) to drive the second circuit board (120) to rotate relative to the first circuit board (110); The driving component (200) has a light transmission channel (210). The first light-emitting device (310) and the second receiving device (420) are spaced apart on the second circuit board (120). The second light-emitting device (320) and the first receiving device (410) are spaced apart on the first circuit board (110). The light signal emitted by the first light-emitting device (310) can be transmitted to the first receiving device (410) through the light transmission channel (210). The light signal emitted by the second light-emitting device (320) can be transmitted to the second receiving device (420) through the light transmission channel (210). The first light-emitting device (310), the first receiving device (410) and the driving component (200) are coaxially arranged.

2. The communication device according to claim 1, characterized in that, In the direction extending perpendicular to the rotation axis of the drive member (200), the distance between the second light-emitting device (320) and the rotation axis is a first distance, and the distance between the second receiving device (420) and the rotation axis is a second distance, wherein the first distance is equal to the second distance.

3. The communication device according to claim 1, characterized in that, At least one of the first light-emitting device (310) and the second light-emitting device (320) is a light-emitting module, and at least one of the first receiving device (410) and the second receiving device (420) is a light-receiving module.

4. The communication device according to claim 1, characterized in that, The first light-emitting device (310) is used to emit light with a first wavelength range, and the first receiving device (410) is used to receive light with a second wavelength range, wherein the first wavelength range is located within the second wavelength range; The second light-emitting device (320) is used to emit light with a third wavelength range, and the second receiving device (420) is used to receive light with a fourth wavelength range, wherein the third wavelength range is located within the fourth wavelength range.

5. The communication device according to claim 4, characterized in that, The second wavelength range does not overlap with the fourth wavelength range.

6. The communication device according to claim 1, characterized in that, The number of the second light-emitting device (320) is at least two, including a first sub-light-emitting device (321) and a second sub-light-emitting device (322). The first sub-light-emitting device (321) and the second sub-light-emitting device (322) are arranged at intervals along the direction surrounding the first receiving device (410), and a portion of the light-emitting area of ​​the first sub-light-emitting device (321) and a portion of the light-emitting area of ​​the second sub-light-emitting device (322) overlap, and the second receiving device (420) is located within the light-emitting area.

7. The communication device according to claim 1, characterized in that, The number of the second receiving devices (420) is at least two, and each second receiving device (420) is arranged at intervals along the direction surrounding the first light-emitting device (310), and each second receiving device (420) is located within the light-emitting illumination area (323) of the second light-emitting device (320).

8. The communication device according to claim 1, characterized in that, The communication device further includes a first signal converter (510) and a second signal converter (520). The first signal converter (510) is disposed on the second circuit board (120) and electrically connected to the first light-emitting device (310). The second signal converter (520) is disposed on the first circuit board (110) and electrically connected to the first receiving device (410); and / or, The communication device further includes a third signal converter (530) and a fourth signal converter (540). The third signal converter (530) is disposed on the first circuit board (110) and electrically connected to the second light-emitting device (320). The fourth signal converter (540) is disposed on the second circuit board (120) and electrically connected to the second receiving device (420).

9. The communication device according to claim 1, characterized in that, The first light-emitting device (310), the second light-emitting device (320), the first receiving device (410) and the second receiving device (420) are all located within the light-transmitting channel (210).

10. A radar, characterized in that, It includes a measuring component and a communication device according to any one of claims 1-9, wherein the measuring component is disposed on the second circuit board (120).

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